The discovery that some CCTV cameras around Moscow streamed prerecorded images, instead of live pictures, has resulted in criminal charges against StroyMontageService, the firm that maintained the network.
Dmitry Kudryavtsev, a director of StroyMontageService, has been arrested and charged with fraud over the alleged scam, which …

Plus...

Surely they would have needed an actual recording from said cameras to put on the loop anyway? If camera X is overlooking a river, you might wonder why it's showing a park instead, etc., so you assume the cameras would all have needed to work at some point to record those pre-recordings.